Coolant flowing back to the recovery tank while squeezing the hoses indicates the radiator cap is not maintaining pressure. It could be the radiator neck or you have the wrong radiator cap. There are 2 different types of radiator cap and they differ in height and design.
Measure the depth of the radiator neck and compare it to the height of the cap. Cap should be minimally higher.
At radiator neck, check for flushness of the seats for the inner radiator cap seal.
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Wednesday, July 4th, 2012 AT 4:25 PM